public class test1 {
    public static void main(String[] args) {
        int i = 1;
        int count = 0;
        while(i <= 100){
            if(i/10 == 9){
                count++;
            }
            if(i % 10 == 9){
                count++;
            }
            i++;
        }
        System.out.println(count);
    }
}
